Output of serialize-javascript affected by jest test

[eslachance]

🐛 Bug Report

When using serialize-javascript through any jest test (in the test or in code run from a test), the output is affected by jest itself.
Specifically, when serializing a function, line returns are added within the function itself. Potentially, maybe, this is because jest modifies the Function.prototype.toString method?

To Reproduce

(Alternatively, see https://gist.github.com/eslachance/6dbd88820f09de4509d4f19c4c0e7ad6 for reproduction)

• Create a jest test
• import serialize-javascript
• Add a console.log of the serialized example.

test("serializes javascript", () => {
  console.log(serialize({
    str  : 'string',
    num  : 0,
    obj  : {foo: 'foo'},
    arr  : [1, 2, 3],
    bool : true,
    nil  : null,
    undef: undefined,
    inf  : Infinity,
    date : new Date("Thu, 28 Apr 2016 22:02:17 GMT"),
    map  : new Map([['hello', 'world']]),
    set  : new Set([123, 456]),
    fn   : function echo(arg) { return arg; },
    re   : /([^\s]+)/g,
    big  : BigInt(10),
  }))
});

The output of this is:

    {"str":"string","num":0,"obj":{"foo":"foo"},"arr":[1,2,3],"bool":true,"nil":null,"undef":undefined,"inf":Infinity,"date":new Date("2016-04-28T22:02:17.000Z"),"map":new Map([["hello","world"]]),"set":new Set([123,456]),"fn":function echo(arg) {
          return arg;
        },"re":new RegExp("([^\\s]+)", "g"),"big":BigInt("10")}

Expected behavior

Output should be in a single line.

{"str":"string","num":0,"obj":{"foo":"foo"},"arr":[1,2,3],"bool":true,"nil":null,"undef":undefined,"inf":Infinity,"date":new Date("2016-04-28T22:02:17.000Z"),"map":new Map([["hello","world"]]),"set":new Set([123,456]),"fn":function echo(arg) { return arg; },"re":new RegExp("([^\\s]+)", "g"),"big":BigInt("10")}

Link to repl or repo (highly encouraged)

https://gist.github.com/eslachance/6dbd88820f09de4509d4f19c4c0e7ad6

envinfo

  System:
    OS: Windows 10 10.0.19041
    CPU: (12) x64 Intel(R) Core(TM) i7-5820K CPU @ 3.30GHz
  Binaries:
    Node: 14.13.0 - C:\Program Files\nodejs\node.EXE
    Yarn: 1.22.4 - C:\Program Files (x86)\Yarn\bin\yarn.CMD
    npm: 6.14.8 - C:\Program Files\nodejs\npm.CMD
  npmPackages:
    jest: ^26.5.2 => 26.5.2

[eslachance]

Originally posted in serialize-javascript repo: yahoo/serialize-javascript#103

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